linux-kernel - Re: [RESEND PATCH] ixgbe: Don't call kmap() on page allocated with GFP

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Message-ID: <YyNZuTlShCviTKXi@iweiny-desk3>
Date:   Thu, 15 Sep 2022 09:58:33 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Tony Nguyen <anthony.l.nguyen@...el.com>
CC:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "John Fastabend" <john.fastabend@...il.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        <linux-hwmon@...r.kernel.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Gurucharan <gurucharanx.g@...el.com>
Subject: Re: [RESEND PATCH] ixgbe: Don't call kmap() on page allocated with
 GFP_ATOMIC

On Thu, Sep 15, 2022 at 09:30:50AM -0700, Tony Nguyen wrote:
> 
> 
> On 9/15/2022 5:40 AM, Fabio M. De Francesco wrote:
> > Pages allocated with GFP_ATOMIC cannot come from Highmem. This is why
> > there is no need to call kmap() on them.
> > 
> > Therefore, don't call kmap() on rx_buffer->page() and instead use a
> > plain page_address() to get the kernel address.
> > 
> > Suggested-by: Ira Weiny <ira.weiny@...el.com>
> > Suggested-by: Alexander Duyck <alexander.duyck@...il.com>
> > Reviewed-by: Ira Weiny <ira.weiny@...el.com>
> > Reviewed-by: Alexander Duyck <alexander.duyck@...il.com>
> > Tested-by: Gurucharan <gurucharanx.g@...el.com>
> > Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> > ---
> > 
> > I send again this patch because it was submitted more than two months ago,
> > Monday 4th July 2022, but for one or more (good?) reasons it has not yet
> > reached Linus' tree. In the meantime I am also forwarding two "Reviewed-by"
> > and one "Tested-by" tags (thanks a lot to Ira, Alexander, Gurucharan).
> > Obviously I have not made any changes to the code.
> 
> Hi Fabio,
> 
> This is accepted into net-next already[1] and will land in the next kernel.

Thanks, sorry just saw this after sending my last.  :-/  :-D

Ira

> 
> Thanks,
> Tony
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=03f51719df032637250af828f9a1ffcc5695982d